Aqua One course filter pads are specifically designed to remove the larger particles from your aquarium.  The coarse filter pad is made of high grade pored foam so the water that passes through the pad will be claned of most larger particles.  The coarse filter pad will serve as a biological and mechanical filter which is essential to the health of your aquarium. 

Key Features:

• 2 Pack
• Part number: 37S
• Suitable for fresh and saltwater aquariums
• Removes the coarse particles in your aquarium
• Adds biological and mechanical filtration
• Suitable for aquis 500 & 700 cannister filtration